These high-performance lubricants are designed for use in controllable-pitch propellers (CPPs) and thrusters, enclosed gear drives and in systems where readily biodegradable and minimally toxic fluids may be required due to potential water-oil interface.

The synthetic oils are said to comply with the US Vessel General Permit (VGP) definition of Environmentally Acceptable Lubricants (EAL) as well as providing "excellent lubrication" - even under severe conditions.

According to ExxonMobil, the benefits include protection against cavitation and other wear issues along with resistance to rust and corrosion.

The ZF announcement adds to the approvals already issued to ExxonMobil's Mobil SHC Aware Gear Series. Nakashima, HHI Hyundai and KTE Nakashima Korea have previously approved the oils for use in their thrusters, while Kemel, BVI and Hwaseung R&A have endorsed the oils for use with their seals.

"The approval from ZF further highlights the performance benefits of Mobil SHC Aware Gear Series oils," said Iain White, global field engineering manager, ExxonMobil Marine. "These lubricants can help ensure operators comply with the VGP regulations, while simultaneously benefiting from reduced maintenance and operating costs."

The Mobil SHC Aware range of EALs also comprises a stern tube oil, a hydraulic oil and general deck grease.

For more information on the Mobil SHC Aware Series oils, please visit mobilshcaware.com.